For the welding of heat-resistant steel and stainless steel, in addition to considering the strength, it is also considered that the main chemical composition of the weld metal is close to the chemical composition of the base metal.

When the chemical constituents of the base metal are high in harmful impurities such as carbon or sulfur or phosphorus, the welding material with strong crack resistance should be selected. Such as low hydrogen type welding consumables.

In China, the most important grades for Stellite Alloy are: Hayness 188, Haynes 25 (L-605), Alloy S-816, UMCo-50, MP-159, FSX-414, X-40, Stellite 6B. Etc., Chinese brands are: GH5188 (GH188), GH159, GH605, K640, DZ40M and so on. Unlike other superalloys, the cobalt alloy is not reinforced by an ordered precipitate phase that is firmly bonded to the matrix, but consists of an austenitic fcc matrix that has been solid solution strengthened and a small amount of carbide distributed in the matrix.